Generation of continuous-variable high-dimensional entanglement with three degrees of freedom and multiplexing quantum dense coding  

作　　者：HUI GUO NA LIU ZHI LI RONGGUO YANG HENGXIN SUN KUI LIU JIANGRUI GAO 

机构地区：[1]State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Opto-Electronics,Shanxi University,Taiyuan 030006,China [2]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China

出　　处：《Photonics Research》2022年第12期2828-2835,共8页光子学研究（英文版）

基　　金：National Natural Science Foundation of China(11874248,12074233);National Key Research and Development Program of China(2016YFA0301404)。

摘　　要：High-dimensional entanglement is a critical foundation for the growing demand for information capacity to implement the high-capacity quantum task.Here,we report continuous-variable high-dimensional entanglement with three degrees of freedom(frequency,polarization,and orbital angular momentum)directly generated with a single type-II optical parametric oscillator(OPO)cavity.By compensating both for dispersion in frequency modes and astigmatism in higher-order transverse modes,the OPO is capable of oscillating simultaneously and outputting thousands of entanglement pairs.The three degrees of freedom high-dimensional entanglement are verified simultaneously possessing frequency comb,spin,and orbital angular momentum entanglement via 14pairs of Hermite–Gaussian mode correlations measurement.Then,the“space-frequency”multiplexing quantum dense coding communication is also demonstrated by using the entanglement resource.It shows the great superiority of high-dimensional entanglement in implementing the high-capacity quantum task.Apart from an increased channel capacity,it is possible to conduct deterministic high-dimensional quantum protocols,quantum imaging,and especially quantum computing.

关 键 词：QUANTUM MOMENTUM CONTINUOUS 

分 类 号：O413[理学—理论物理] TN918[理学—物理]